-OPK, EWCM, +OPK , Oh My!

Using clear blue opk. I had ewcm cd 10 but my opk hadn’t arrived yet so I didn’t test until cd 11 in the evening and got the solid circle (which means negative) today is cd 12 tested fmu and got another solid circle. This afternoon I had another patch of ewcm and after a few hours tested and got a solid happy face 😊 (meaning highly fertile). Am I highly fertile or could this be a false positive? I know you’re supposed to test at the same time every day and that the morning is better but does it matter? Has anyone had a negative in the morning and then a positive in the evening? TIA